Police want to hear from anyone who knows anything about an explosion at a surf club in the Lake Macquarie region.
The blast rang out in the toilets of the Redhead Beach Surf Club at around 10:00pm on Tuesday evening.
The end result was serious damage to the ceiling and roof of the premises, while a window was completely blown out.
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Police set up a crime scene which was examined by forensic specialists.
Investigators think hoodlums are behind the blast.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000.